Evolution of non-Kramers doublets in magnetic field in PrNi2Cd20 and PrPd2Cd20

Konic, Alex M.; Adhikari, R. B.; Kunwar, D. L.; Kirmani, Ammar A.; Breindel, A.; Sheng, R.; Maple, M. B.; Dzero, M.; Almasan, Carmen C.

doi:10.1103/physrevb.104.205139

Evolution of non-Kramers doublets in magnetic field in PrNi2 Cd20 and PrPd2 Cd20

Journal Article · Sun Nov 28 23:00:00 EST 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.205139· OSTI ID:1979681

^[1]; Adhikari, R. B. ^[2]; Kunwar, D. L. ^[2]; ^[2]; Breindel, A. ^[3]; Sheng, R. ^[3]; Maple, M. B. ^[3]; Dzero, M. ^[2]; ^[2]

Kent State Univ., Kent, OH (United States); OSTI
Kent State Univ., Kent, OH (United States)
Univ. of California, San Diego, La Jolla, CA (United States)

Praseodymium-based 1-2-20 cage compounds PrT₂X₂₀ (T is generally Ti, V, Nb, Ru, Rh, Ir; and X is either Al, Zn, or Cd) provide yet another platform to study nontrivial electronic states of matter ranging from topological and magnetic orders to unconventional multipolar orders and superconductivity. In this paper, we report measurements of the electronic heat capacity in two Pr-based 1-2-20 materials: PrNi₂ Cd₂₀ and PrPd₂ Cd₂₀. We find that the lowest-energy multiplet of the Pr 4f² valence configuration is a Γ₃ non-Kramers doublet and the first excited triplet is assumed to be a magnetic Γ₅. By analyzing the dependence of the energy splitting between the ground and first excited singlet states on an external magnetic field, we found that the maximum in the heat capacity corresponding to the Schottky anomaly in PrPd₂ Cd₂₀, unlike PrNi₂ Cd₂₀, shows a pronounced linear dependence on an external magnetic field at higher field values. In conclusion, this effect is associated with the exchange interactions between the field-induced magnetic dipole moments.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Connecticut, Storrs, CT (United States); Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

Grant/Contract Number:: SC0016481; FG02-84ER45105

OSTI ID:: 1979681

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 20 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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